After Initial clear, your controller have factory default Data Input Output settings, and it is different than it was before (parity, baud rate, stop bits etc.). Change it in Setting Data/Common Bits according to your serial communication software. Spreading caracters
or double lines are usually connected to the same issue.
It is good to make backup of %MPF, %SPF, %SEA, %TEA1 (%TEA2),%TOA and mybe
%ZOA and %RPA.